Additive, dominant parental effects control the inheritance of grain cadmium accumulation in hybrid rice

Yao, Wenyuan; Sun, Liang; Zhou, Hao; Yang, Fei; Mao, Donghai; Wang, Jiurong; Chen, Lianghui; Guo-yu, Zhang; Dai, Jinpeng; Guo-ying, Xiao; Chen, Caiyan

doi:10.1007/s11032-015-0246-0

Cited by 24 publications

(11 citation statements)

References 21 publications

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“…We found that variation in grain Cd levels between the hybrids and their paternal inbred lines existed, but no uniform pattern was observed. Hybrids accumulate more, less, or similar grain Cd levels to their paternal lines in a case-dependent manner, which agreed with our previous study (Yao et al, 2015 ; data not shown). In summary, our data indicated the hybrids do not accumulate more Cd than do the inbred cultivars or their paternal inbred lines.…”

Section: Resultssupporting

confidence: 93%

“…For wet digestions, 2.0000 g subsamples were placed in an acid mixture of HNO 3 -HClO 4 (6:1, v/v). The process of wet digestion was similar to that in our previous study (Yao et al, 2015 ). Blank digests with no samples and the certified standard material samples (CRM rice; GBW10045, GSB-23) were also treated the same way.…”

Section: Methodssupporting

confidence: 74%

“…Previous studies have indicated that Indica rice varieties usually accumulate more Cd than do Japonica rice varieties (Chaney et al, 2004 ; Hui et al, 2006 ). However, a consistent conclusion has not been obtained by comparing Cd accumulation between two cultivar types: hybrid rice and traditional inbred cultivars (Liu et al, 2005 ; Gong et al, 2006 ; Gong and Pan, 2006 ; Yao et al, 2015 ). Hybrid rice is distinct from traditional cultivated rice through its breeding process and the fact that rice hybrids are usually developed by crossing two parental inbred lines.…”

Section: Discussionmentioning

confidence: 98%

“…Consequently, the grain Cd levels of rice hybrids could be decided by the genetic backgrounds of the parental lines. Our previous report showed that additive parental effects dominated the grain Cd performance in hybrid rice with no obvious heterosis present (Yao et al, 2015 ). By comparing grain Cd accumulation between 617 Indica rice hybrids and 68 cultivars of different ecotypes in this study, we discovered that hybrid rice did accumulate more grain Cd than did the tej and trj ecotypes, but not more than the ind or aus ecotypes (Figure 2D ).…”

Section: Discussionmentioning

confidence: 99%

“…In our previous study, we performed an incomplete diallel mating design to analyze the effect of heterosis on rice grain Cd accumulation, and found that additive parental genetic effects determined the grain-Cd level in the hybrids (Yao et al, 2015 ). To further elucidate the genotypic variations and the genetic mechanism of grain-Cd accumulation in hybrids in a broad genetic background, we examined the performance of 617 elite hybrid varieties collected from the middle and lower Yangtze River Valley in China and compared it with that of 68 worldwide inbred cultivars in Cd polluted paddy fields.…”

Section: Introductionmentioning

confidence: 99%

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Genetic Diversity, Rather than Cultivar Type, Determines Relative Grain Cd Accumulation in Hybrid Rice

Sun

Jiang

et al. 2016

Front. Plant Sci.

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Cadmium (Cd) is a toxic element, and rice is known to be a leading source of dietary Cd for people who consume rice as their main caloric resource. Hybrid rice has dominated rice production in southern China and has been adopted worldwide. The characteristics of high yield heterosis of rice hybrids makes the public think intuitively that the hybrid rice accumulates more Cd in grain than do inbred cultivars. A detailed understanding of the genetic basis of grain Cd accumulation in hybrids and developing Cd-safe rice are one of the top priorities for hybrid rice breeders at present. In this study, we investigated genetic diversity and grain Cd levels in 617 elite rice hybrids collected from the middle and lower Yangtze River Valley in China and 68 inbred cultivars from around the world. We found that there are large variations in grain Cd accumulation in both the hybrids and their inbred counterparts. However, we found grain Cd levels in the rice hybrids to be similar to the levels in indica rice inbreds, suggesting that the hybrids do not accumulate more Cd than do the inbred rice cultivars. Further analysis revealed that the high heritability of Cd accumulation in the grain and the single indica population structure increases the risk of Cd over-accumulation in hybrid rice. The genetic effects of Cd-related QTLs, which have been identified in related Cd-QTL mapping studies, were also determined in the hybrid rice population. Four QTLs were identified as being associated with the variation in grain Cd levels; three of these loci exhibited obvious indica-japonica differentiations. Our study will provide a better understanding of grain Cd accumulations in hybrid rice, and pave the way toward effective breeding for high-yielding, low grain-Cd hybrids in the future.

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Section: Resultssupporting

confidence: 93%

Section: Methodssupporting

confidence: 74%